The isoxazolidines: the effects of steric factor and hydrophobic chain length on the corrosion inhibition of mild steel in acidic medium

Ali, Shaikh A.; El-Shareef, A.M.; Alghamdi, Radhwan; Saeed, M.T.

doi:10.1016/j.corsci.2004.11.007

Cited by 129 publications

(45 citation statements)

References 19 publications

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“…The corrosion inhibitor is usually classified as anodic or cathodic type when the change in corrosion potential (E corr ) value is greater than 85 mV. The largest displacement in E corr value on the blank was 40 mV (Table 2) after the addition of 2-chloro 3-formyl quinoline, indicating that the inhibitor acts as a mixed type inhibitor [7,8].…”

Section: Tafel Polarization Measurementmentioning

confidence: 99%

Inhibition study of mild steel corrosion in 1 M hydrochloric acid solution by 2-chloro 3-formyl quinoline

Prasanna¹,

Praveen²,

Hebbar³

et al. 2015

Int J Ind Chem

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The corrosion inhibition study of 2-chloro 3-formyl quinoline was conducted for mild steel corrosion in 1 M hydrochloric acid solution at a temperature range of 303-333 K by chemical and electrochemical measurements. Inhibition efficiency increases with the increase of inhibitor concentration but decreases with increasing temperature. The polarization measurement reveals that the inhibitor acts as the mixed type and this inhibition effect is attributed to the adsorption of the inhibitor on the surface of mild steel from the bulk of the solution. The adsorption of 2-chloro 3-formyl quinoline on mild steel surface is exothermic and obeys the Freundlich adsorption isotherm. Thermodynamic parameters and activation parameters were calculated and discussed in depth. Scanning electron microscopy (SEM) micrographs were used to investigate the surface morphology of the steel sample in presence and absence of inhibitor.

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Section: Tafel Polarization Measurementmentioning

confidence: 99%

Inhibition study of mild steel corrosion in 1 M hydrochloric acid solution by 2-chloro 3-formyl quinoline

Prasanna¹,

Praveen²,

Hebbar³

et al. 2015

Int J Ind Chem

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“…In general free energy of adsorption around -40 kJ/mol is indicative of chemisorption and that around -20 kJ/mol is physisorption [39]. The negative ∆Gads obtained means that the adsorption of gum exudates of Azadirachta indica was spontaneous which was the direct evidence for strong adsorption of gum exudates of Azadirachta indica on carbon steel [40].…”

Section: Weight Loss Measurementsmentioning

confidence: 72%

Mitigation of Acid Corrosion on Carbon Steel by Naturally Occurring Gum Exudate

Manickam¹,

Dheenadhayalan²,

Jaganathan³

2018

Asian J. Chem.

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Gum exudates of Azadirachta indica (GAI) was tested as corrosion inhibitor for carbon steel in 1 N H2SO4 by means of different techniques viz., gravimetric experiments, electrochemical polarization and impedance studies, IR and SEM techniques. Nature of adsorption is reported and it follows Langmuir isotherm. Polarization method indicated mixed mode behaviour of the inhibitor. AC impedance studies supported mitigation effects of gum exudates of Azadirachta indica. IR and SEM studies reveal the protection of carbon steel through adsorption.

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“…The study shows that the presence of BPTU and CPTU shifts the Ecorr in the positive direction. This indicates the control of the anodic reaction owing to the blocking of anodic site by chemisorption of the electron rich N-S function ability to the positive centers of the metal (Ali et al, 2005). The negative values of ΔGads indicated impulsive adsorption and a strong interface between the inhibitor molecules and the surface of the metal (Savithri & Mayanna, 1996).…”

Section: Kinetic Parameters Of Adsorptionmentioning

confidence: 99%

Inhibition of Mild Steel Corrosion in Acid Medium

Shetty¹,

Shetty²

2017

IJTech

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Since inhibition is the simplest mechanism used for mitigating the corrosion of metals and alloys, particularly in acidic environments, the present work aims to investigate the inhibiting effect of N-benzyl-N′-phenyl thiourea (BPTU) and N-cyclohexyl-N′-phenyl thiourea (CPTU) on mild steel corrosion in 0.1M HCl medium using the Tafel extrapolation technique. Tafel experiments were conducted with ±250 mV vs. rest potential (RP) in steps of 20 mV from the cathodic side for recording the corrosion currents, and then, the Tafel plot of potential vs. current was drawn for determining the corrosion current density (icorr). The linear polarization method was also used for validating the Tafel results. It was performed by polarizing the specimen with ±20 mV vs. RP in steps of 5 mV, and the corrosion currents were noted. The plot of potential vs. current was drawn for calculating icorr. The study reveals that both BPTU and CPTU act as anodic inhibitors for mild steel in the HCl medium, and good inhibition efficiency (>97%) was evidenced from both the compounds even at elevated temperatures. The study also reveals that the investigated compounds get adsorbed quickly on the steel surface, following Temkin's adsorption isotherm. The kinetic parameters obtained from the study indicated that the inhibition was governed by a chemisorption mechanism and the presence of inhibitors substantially reduced the metal dissolution in the studied temperature range. The investigation shows that there was a good correlation between the Tafel extrapolation and linear polarization results.

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The isoxazolidines: the effects of steric factor and hydrophobic chain length on the corrosion inhibition of mild steel in acidic medium

Cited by 129 publications

References 19 publications

Inhibition study of mild steel corrosion in 1 M hydrochloric acid solution by 2-chloro 3-formyl quinoline

Inhibition study of mild steel corrosion in 1 M hydrochloric acid solution by 2-chloro 3-formyl quinoline

Mitigation of Acid Corrosion on Carbon Steel by Naturally Occurring Gum Exudate

Inhibition of Mild Steel Corrosion in Acid Medium

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